The actor opened up about the physical and mental toll training for the 2017 film had on him.

Anyone who’s seen the movie can attest that Efron’s body looks almost unreal on screen.

“ThatBaywatchlook, I don’t know if that’s really attainable,” Efron toldMen’s Health.

Zac Efron

Photo: Getty Images

“There’s just too little water in the skin.

Like, it’s fake; it looks CGI’d.”

In addition to the intense training, Efron wasn’t sleeping enough during filming.

Waking up at 4 a.m. to work out after late nights on set led toinsomnia, said Efron.

He also “fell into a pretty bad depression, for a long time,” he revealed.

“Something about that experience burned me out.

I had a really hard time re-centering.

In fact, it might even be impossible.

“Before is when it’s most miserable, and when you finally just commit and jump in there.

From that point forward, you’ve conquered something deep within you,” he says.